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整轴的电缆往往不是整轴使用,对其剩余的部分在盘点时用米尺实际丈量,虽然准确,但要解盘放开,费时费事。用仪器测量电阻率来计算,虽比较科学,但须配备测量仪器和工具,还要切开电缆端面,测量后又得封好,也是很麻烦的。为便于现场盘点,用公式计算比较简易,既不用放开电缆,又不用切开电缆端面。
The entire shaft of the cable is often not used as a whole shaft, and the rest of the cable is actually measured with a meter rule when counting. Although accurate, it is necessary to release the disk and release it, which takes time and effort. Calculating the resistivity using an instrument is relatively scientific, but it must be equipped with measuring instruments and tools. It is also necessary to cut the end face of the cable and seal it after measurement. This is also troublesome. In order to facilitate on-site inventory, calculations using the formula are relatively simple, not only do not release the cable, but do not cut the end of the cable.